v0.4.0

BREAKING CHANGE
This version switches from GraphQL::Batch to GraphQL::Dataloader. If you were previously using GraphQL::Extras::Preload, you'll need to make the following change to your schema:

- use GraphQL::Batch
+ use GraphQL::Dataloader

Please also see the caveats regarding GraphQL::Dataloader here: https://graphql-ruby.org/dataloader/overview.html#fibers.